Fire-arch for steam-boilers.



. Patented NOV. 4, I902. N. W. MAGINTOSH. FIRE ARCH FOR STEAM BOILERS.

(Application filed Nov. '7, 1901.)

(No Model.)

WITNESSES: 1%

' A ORNEY NEIL w. MAOINTOSH,

ATENT @Frice.

OF NEWV YORK, N Y.

FIRE-ARCH FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 712,695, dated November 4, 1902.

Application'filed November '7, 1901. Serial No. 81,368. (No model.)

T0 aZZ whom 625 may concern.-

Be it known that I, NEIL W. MAoINTosH, a citizen of the United States, residing at the borough of the Bronx, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Fire-Arches for Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to steam-boilers and boiler-furnaces, and particularly to a waterarch located at the front of a boiler. This water-arch is designed to take the place of the brick arch usually built over the furnace-door just in front of the boiler, and it is also designed to act as a feed-water heater and settling-chamber, and in accordance with my invention means are provided for at all times maintaining this water-arch full of water and for feeding water into the boiler and discharging water out of the boiler through this water-arch and for removing from this waterarch the sediment which will collect therein.

I will describe a steam-boiler having my invention applied thereto and then point out the novel features thereof in the claims.

In the accompanying drawings, Figure 1 is a view, partly in elevation and partlyin vertical section, of a steam-boiler furnace and appurtenant parts having my invention applied thereto. The section is taken on a plane in front of the boiler. Fig. 2 is a central vertical and longitudinal sectional view of the parts shown in Fig. 1, the boiler being shown in elevation.

The boiler 1 here shown is of the well-known tubular type and is supported in the usual manner. Beneath the boiler, at its front end, is the usual combustion-chamber 2, a grate 3, the connecting-bridge 4 at the rear of thecombustion-chamber, and the ash-pit 5 beneath the grate 3. The front wall 6 of the furnace is provided with the usual door or doors 7 for the ash-pit.

Mounted upon the usual dead-plate S,which.

forms the lower wall of the fuel-opening in front of the combustion-chamber and beneath the boiler, is a chamber or receptacle 9, which constitutes a'water arch or bridge and feedwater heater. The ends of the arch are embedded in the side walls of the furnace. The

chamber or arch 9 is preferablyof steel, and, as here shown, its lower wall is arched or curved and constitutes the upper and side walls of the fuel-opening. The upper or top Wall of the chamber is shown as being straight,

though, if desired, it may be circular and conform to the outer surface of the boiler. Brick or other equivalent material 10 may be used to close the space between the top of the chamber and the boiler. The front wall of the chamber or receptacle 9 is flush with the front wall 6 of the furnace. The usual door 11 for the fuel-passage may be supported on the front' wall of the chamber 9.

The arch or chamber 9 is adapted to contain water at all times, and the water supplied to the boiler first passes through it. In this manner the arch or chamber constitutes a settling-chamber. A blow-off pipe 12, having the usual valve, (not shown,) is provided for the chamber, and the boiler isblown off through the chamber and pipe. The water is supplied to the arch through a supply-pipe 13. The water passes into the boiler through a pipe 14.. The pipe 14 enters the boiler at a low level, considerably below the water-line thereof, and leaves the arch at a high level. With this arrangement of water-feed the water is heated to a considerable extent before entering the boiler, and it is introduced into the boiler at the lower portion thereof, where it is subjected to the greatest heat. A more rapid heating of the water will therefore result. Any steam that may be generated in the arch, chamber, or bridge 9 has a free passage therefrom to the steam-space of the boiler through a pipe or conduit 15, which extends from the upper part of the water-arch to the steam-space of the boiler, and which also serves to maintain an equilibrium of pressure in the water-arch and boiler. ThusI prevent any possibility of forcing the water out of the avatar-arch by the generation of steam within the water-arch and assure that the waterarch shall be at all times full of water.

The constant presence of water in the water-arch protects the metal parts from extreme heat and variations of temperature, and there is no bulging of the front wall of the furnace, such as usually results in a brick-filled arch from the extreme and variable temperatures present at this part of a boiler-furnace.

As aforesaid, the water-chamber 9 acts as a settling-chamber, receiving practically all the sediment and deposits from the water, and I provide removable means for access to the water-chamber for cleaning out such sediment and deposits therefrom, such means being shown as consisting of hand-pole plates 16 of usual construction.

It is evident that modifications may be made in the construction shown and above particularly described within the spirit and scope of my invention.

Having now described my invention, what I claim, and desire to secure/by Letters Patent, is

1. The combination of a steam-boiler and furnace, a combustion-chamber, the wall of the furnace having a fuel-opening, a waterchamber located at the front of the combustion-chamber and about the fuel-opening, a water supply conduit entering the waterchamber, a conduit extending from the upper part of the water-chamber and entering the boilerat a low level, and another conduit extending from the upper part of the waterchamber and entering the boiler in the steamspace thereof.

2. The combination of a steam-boiler-and furnace, a combustion-chamber, the wall of the furnace having a fuel-opening, a waterchamber located at the front of the combustion-chamber and about the fuel-opening and below the level of the lowest part of the boiler, a water-supply conduit entering the Waterchamber, a conduit extending from the upper part of the water-chamber and entering the boiler at a low level, another conduit extending from the upper part of the waterchamber and entering the boiler at a high level, a blow-off pipe for the boiler extending from the lower part of the water-chamber, and removable means located at; lower parts of the water-chamber for access to the interior thereof, substantially as set forth.

In testimony whereof I have affixed my signature in presence of two witnesses.

NEIL \V. DIACINTOSH.

\Vitnesses:

HENRY D. WILLIAMS, ARCHIBALD MCINTOSH. 

